Research on Process of Hydrometallurgical Extracting Au, …
Copper anode slime is an increasingly significant resource for precious metals such as Au, Ag and Pd. ... 94.79% by cyanide leaching, and 95.01%, 79.84%, 96.59% by chloride leaching, and about 95.21%, 95.66%, 48.79% by thiourea/thiosulfate leaching. Download to read the full chapter text. Chapter PDF.
Hydrochemically separation of gold from Copper Anode …
in the thiourea leaching of gold. Thiourea can form cationic complex with gold in the gold extraction process from copper anode slime. Thiourea consumption levels were also examined during the leaching operations for different leaching parameters, i.e. solution volume, concentration ratio of thiourea/H 2 O 2, pH, leaching time and agitation rate.
effect of reaction temperature on the leaching of metals.
Download scientific diagram | effect of reaction temperature on the leaching of metals. notes: naClo concentration, .054 m; HCl concentration, 3 m; stirring speed ...
Mechanism and kinetics of gold leaching from copper anode slime …
The effect of practical parameters, viz., temperature, time, concentration, mechanical activation, and the stirring rate, was investigated using a combination of H 2 O 2, BmimHSO 4, and thiourea as green solvent to recover the gold from anode copper slime in an electrorefining plant. The leaching kinetics of Au in the selected slime was …
Recovery of Silver and Gold from Copper Anode Slimes
Silver and gold were extracted from copper anode slimes (1.54 wt.% of Ag, 0.1 wt.% of Au, and 12 wt.% of Cu) using sulfuric acid with the addition of MnO 2 and …
Gold recovery from copper anode slime by means of …
Thiourea powder, hydrogen peroxide (30%) (as the oxidizing agent), and sulfuric acid (98%) (for pH adjustment) were used for gold leaching with thiourea. In the next step, 5 g of the pretreated copper anode slime was added to the thiourea solution, and the resulting solution was then stirred for 24 h at 500 rpm. Finally, residue was …
Leaching of gold and palladium with aqueous ozone in dilute chloride
The final step consisted of silver and gold thiourea leaching in presence of ozone. Reported extractions were 60% Au and 55% Ag but in 150 days. ... Ozone with outstanding oxidation capacity has tremendous potential to leach metals from anode slime. The leaching behavior of copper from copper anode slime under ozone was …
Hydrochemically separation of gold from Copper Anode Slime …
So, the main objective of the current work is gold separation from copper anode slime as a rich secondary source of gold by determining the mechanism of the reaction between thiourea (TU) and H2O2 in the thiourea leaching of gold. Thiourea can form cationic complex with gold in the gold extraction process from copper anode slime. Thiourea ...
Hydrochemically separation of gold from Copper Anode …
between thiourea (TU) and H 2 O 2 in the thiourea leaching of gold. Thiourea can form cationic complex with gold in the gold extraction process from copper anode slime. Thiourea consumption levels were also examined during the leaching operations for different leaching parameters, i.e. solution volume, concentration ratio of thiourea/H 2 O 2
Materials Proceedings | Free Full-Text | Leaching Kinetics of …
AMA Style. Kurniawan K, Lee J-c, Kim J, Kim R, Kim S. Leaching Kinetics of Selenium, Tellurium and Silver from Copper Anode Slime by Sulfuric Acid Leaching in the Presence of Manganese(IV) Oxide and Graphite.
Gold recovery from copper anode slime by means of …
Thiourea powder, hydrogen peroxide (30%) (as the oxidizing agent), and sulfuric acid (98%) (for pH adjustment) were used for gold leaching with thiourea. In …
Recovery of metals from chloride leach solutions of anode …
During our ongoing work on the recovery of gold from the chloride leach liquor of anode slime which contained copper, nickel, silver, tin and zinc, Au(III) was selectively recovered by solvent extraction with Cyanex 272 (Xing et al., 2018a). ... cyanide and thiourea (Arroyo et al., 2008; Ohto et al., 1997a; Sanuki et al., 2000; Zuo and …
مقاله Hydrochemically separation of gold from Copper Anode Slime …
Hydrochemically separation of gold from Copper Anode Slime by means of Thiourea solution
Hydrochemically separation of gold from Copper Anode Slime …
So, the main objective of the current work is gold separation from copper anode slime as a rich secondary source of gold by determining the mechanism of the reaction between thiourea (TU) and Hydrogen peroxide (H2O2) in the thiourea leaching of gold. Thiourea can form cationic complex with gold in gold extraction process from copper anode slime ...
A green and economical process for resource recovery from …
Processes with non-cyanide, such as thiosulfate leaching (Dong et al., 2019; Feng and van Deventer, 2007), thiourea leaching (Adams et al., 2020; Murthy et al., 2003), and chloride leaching (Ahtiainen and Lundstrom, 2019) were also investigated. ... Augmenting metal leaching from copper anode slime by sulfuric acid in the presence of …
Hydrochemically separation of gold from Copper Anode …
in the thiourea leaching of gold. Thiourea can form cationic complex with gold in the gold extraction process from copper anode slime. Thiourea consumption levels were also …
Gold recovery from copper anode slime by means of …
Meanwhile, the leaching mechanism of copper from anode slime under ozone is proposed based on the form and the phase composition of the raw material and the leaching residue. All forms of copper in the raw materials are converted into CuSO 4, Te 2− into H 2 TeO 4 and Se 2− into SeO 3 2− under ozone.
Gold recovery from copper anode slime by means of …
Leaching of gold in the copper anode slime is affected by some elements such as silver, iron, and selenium. ... In the next step, 5 g of the pretreated copper anode slime was added to the thiourea ...
Effect of Oxidizing Agents in Extracting Gold from Anode Slime
Some researchers (Kusnierov et al., 1993; Kucha, 2001) reported that thiourea was very effective for recovering valuable metals from copper concentrates. Composition that is suitable for treating anode slime by thiourea are lead concentrations <15% and Ag <0.5%. Thiourea leaching has been performed in hydrochloric, sulfuric and nitric acid media.
Some Studies on Sulfuric Acid Leaching of Anode Slime …
The most effective hydrometallurgical processing of anode slime is based on a chlorination route. However, it requires special attention with respect to pollution problems and construction materials. To minimize the problems, a new hydrometallurgical approach was pursued for the recovery of valuable metals and metalloids from copper …
Selective separation and recovery of selenium from copper anode slime …
The copper anode slime leaching experiments were conducted in 250 mL round-bottom flasks. The reaction solution was prepared according to a certain ratio of H 2 SO 4, HCl and NaCl, and the copper anode slime is added to the reaction solution according to a certain liquid–solid ratio. The temperature was set and controlled by a …
Recovery of scattered and precious metals from copper …
Ranjbar et al. (2014) used a thiourea solution to completely dissolve Au in the anode slime, but thiourea is easily to decomposed in the presence of oxidizing …
Recovery of Gold and Silver from Copper Anode Slime
This study has shown that gold and silver can be recovered from a complex anode slime containing copper, selenium, and tellurium, but a carefully planned leaching procedure is required. To extract the gold with thiourea, it is necessary to first remove the copper, selenium, tellurium, and most of the silver from the mixture.
Leaching of gold and silver from anode slime with a …
The leaching percentage of the metals present in the anode slime (Au, Ag, Cu, Ni, Sn, and Zn) was investigated as a function of the composition of the mixture, reaction time
Chlorine leaching of Au from copper anode slimes using the …
The Se-removed slime was dried before leaching with a 100 g L −1 sulphuric acid solution at 90°C for 1 hr in order to dissolve and separate Cu from the slime (Fabian, 1998). The final solid phase (i.e. the copper anode slime remaining after Se and Cu removal) was used for Au leaching studies.
Oxidative Leaching Treatment of Copper Anode Slime in a …
Mise au point d'un traitement des boues anodiques de cuivre dans une solution d'acide nitrique contenant du chlorure de sodium. Etude a partir de considerations thermodynamiques et des mesures des vitesses de lixiviation, de la reaction de lixiviation acide et de la lixiviation oxydante de deux boues anodiques de cuivre
Metallurgical Process for Total Recovery of All Constituent …
All the approaches mentioned above have been studied for decades and are still being improved/developed until present. Recent attempts in the area of metallurgical …
The leaching efficiency of tin anode slime by sulfuric acid
Tin anode slime is a by-product of the tin electrolytic refining process. This study investigated a route to separate Sn, Sb, Bi, and Cu from tin anode slime after leaching with hydrochloric acid.
Leaching of the Mixture of Metallic Gold and Silver
In order to develop a hydrometallurgical process to recover gold and silver from anode slime resulted from the treatment of copper sludge, leaching experiments of the anode slime were performed by ...
Thiourea Leaching: An Update on a Sustainable Approach for …
Thiourea leaching was completed on crushed waste PCB samples by thiourea leaching using a solution of 20 g/L thiourea, 6 g/L iron (III), and 10 g/L sulfuric …